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-1=-13+4B
We move all terms to the left:
-1-(-13+4B)=0
We add all the numbers together, and all the variables
-(4B-13)-1=0
We get rid of parentheses
-4B+13-1=0
We add all the numbers together, and all the variables
-4B+12=0
We move all terms containing B to the left, all other terms to the right
-4B=-12
B=-12/-4
B=+3
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